Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / MS / Internal / TextFormatting / DrawingState.cs / 1 / DrawingState.cs
//------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation // // File: DrawingState.cs // // Contents: Drawing state of full text // // Created: 1-29-2005 Worachai Chaoweeraprasit (wchao) // //----------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Media; namespace MS.Internal.TextFormatting { ////// Formatting state of full text /// internal sealed class DrawingState : IDisposable { private TextMetrics.FullTextLine _currentLine; // full text line currently formatted private DrawingContext _drawingContext; // current drawing context private Point _lineOrigin; // line origin XY relative to drawing context reference location private Point _vectorToLineOrigin; // vector to line origin in UV relative to paragraph start private MatrixTransform _antiInversion; // anti-inversion transform applied on drawing surface private bool _overrideBaseGuidelineY; // a flag indicating whether a new guideline overrides the line's Y guideline private double _baseGuidelineY; // the Y guideline of the text line. ////// Construct drawing state for full text /// internal DrawingState( DrawingContext drawingContext, Point lineOrigin, MatrixTransform antiInversion, TextMetrics.FullTextLine currentLine ) { _drawingContext = drawingContext; _antiInversion = antiInversion; _currentLine = currentLine; if (antiInversion == null) { _lineOrigin = lineOrigin; } else { _vectorToLineOrigin = lineOrigin; } if (_drawingContext != null) { // LineServices draws GlyphRun and TextDecorations in multiple // callbacks and GlyphRuns may have different baselines. Pushing guideline // for each DrawGlyphRun are too costly. We optimize for the common case where // GlyphRuns and TextDecorations in the TextLine share the same baseline. _baseGuidelineY = lineOrigin.Y + currentLine.Baseline; _drawingContext.PushGuidelineY1(_baseGuidelineY); } } ////// Set guideline Y for a drawing operation if necessary. It is a no-op if the Y value is the same /// as the guideline Y of the line. Otherwise, it will push the Y to override the guideline of the line. /// A SetGuidelineY() must be paired with an UnsetGuidelineY() to ensure balanced push and pop. /// internal void SetGuidelineY(double runGuidelineY) { if (_drawingContext == null) return; Invariant.Assert(!_overrideBaseGuidelineY); if (runGuidelineY != _baseGuidelineY) { // Push a new guideline to override the line's guideline _drawingContext.PushGuidelineY1(runGuidelineY); _overrideBaseGuidelineY = true; // the new Guideline Y overrides the line's guideline until next unset. } } ////// Unset guideline Y for a drawing operation if necessary. It is a no-op if the Y value is the same /// as the guideline Y of the line. Otherwise, it will push the Y to override the guideline of the line. /// A SetGuidelineY() must be paired with an UnsetGuidelineY() to ensure balanced push and pop. /// internal void UnsetGuidelineY() { if (_overrideBaseGuidelineY) { _drawingContext.Pop(); _overrideBaseGuidelineY = false; } } ////// Clean up internal state. /// public void Dispose() { // clear the guideline at line's baseline if (_drawingContext != null) { _drawingContext.Pop(); } } ////// Current drawing context /// internal DrawingContext DrawingContext { get { return _drawingContext; } } ////// Anti-inversion transform applied on drawing surface /// internal MatrixTransform AntiInversion { get { return _antiInversion; } } ////// Origin XY of the current line relative to the drawing context reference location /// internal Point LineOrigin { get { return _lineOrigin; } } ////// Vector to line origin in UV relative to paragraph start /// internal Point VectorToLineOrigin { get { return _vectorToLineOrigin; } } ////// Line currently being drawn /// internal TextMetrics.FullTextLine CurrentLine { get { return _currentLine; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------ // // Microsoft Windows Client Platform // Copyright (C) Microsoft Corporation // // File: DrawingState.cs // // Contents: Drawing state of full text // // Created: 1-29-2005 Worachai Chaoweeraprasit (wchao) // //----------------------------------------------------------------------- using System; using System.Diagnostics; using System.Windows; using System.Windows.Media; namespace MS.Internal.TextFormatting { ////// Formatting state of full text /// internal sealed class DrawingState : IDisposable { private TextMetrics.FullTextLine _currentLine; // full text line currently formatted private DrawingContext _drawingContext; // current drawing context private Point _lineOrigin; // line origin XY relative to drawing context reference location private Point _vectorToLineOrigin; // vector to line origin in UV relative to paragraph start private MatrixTransform _antiInversion; // anti-inversion transform applied on drawing surface private bool _overrideBaseGuidelineY; // a flag indicating whether a new guideline overrides the line's Y guideline private double _baseGuidelineY; // the Y guideline of the text line. ////// Construct drawing state for full text /// internal DrawingState( DrawingContext drawingContext, Point lineOrigin, MatrixTransform antiInversion, TextMetrics.FullTextLine currentLine ) { _drawingContext = drawingContext; _antiInversion = antiInversion; _currentLine = currentLine; if (antiInversion == null) { _lineOrigin = lineOrigin; } else { _vectorToLineOrigin = lineOrigin; } if (_drawingContext != null) { // LineServices draws GlyphRun and TextDecorations in multiple // callbacks and GlyphRuns may have different baselines. Pushing guideline // for each DrawGlyphRun are too costly. We optimize for the common case where // GlyphRuns and TextDecorations in the TextLine share the same baseline. _baseGuidelineY = lineOrigin.Y + currentLine.Baseline; _drawingContext.PushGuidelineY1(_baseGuidelineY); } } ////// Set guideline Y for a drawing operation if necessary. It is a no-op if the Y value is the same /// as the guideline Y of the line. Otherwise, it will push the Y to override the guideline of the line. /// A SetGuidelineY() must be paired with an UnsetGuidelineY() to ensure balanced push and pop. /// internal void SetGuidelineY(double runGuidelineY) { if (_drawingContext == null) return; Invariant.Assert(!_overrideBaseGuidelineY); if (runGuidelineY != _baseGuidelineY) { // Push a new guideline to override the line's guideline _drawingContext.PushGuidelineY1(runGuidelineY); _overrideBaseGuidelineY = true; // the new Guideline Y overrides the line's guideline until next unset. } } ////// Unset guideline Y for a drawing operation if necessary. It is a no-op if the Y value is the same /// as the guideline Y of the line. Otherwise, it will push the Y to override the guideline of the line. /// A SetGuidelineY() must be paired with an UnsetGuidelineY() to ensure balanced push and pop. /// internal void UnsetGuidelineY() { if (_overrideBaseGuidelineY) { _drawingContext.Pop(); _overrideBaseGuidelineY = false; } } ////// Clean up internal state. /// public void Dispose() { // clear the guideline at line's baseline if (_drawingContext != null) { _drawingContext.Pop(); } } ////// Current drawing context /// internal DrawingContext DrawingContext { get { return _drawingContext; } } ////// Anti-inversion transform applied on drawing surface /// internal MatrixTransform AntiInversion { get { return _antiInversion; } } ////// Origin XY of the current line relative to the drawing context reference location /// internal Point LineOrigin { get { return _lineOrigin; } } ////// Vector to line origin in UV relative to paragraph start /// internal Point VectorToLineOrigin { get { return _vectorToLineOrigin; } } ////// Line currently being drawn /// internal TextMetrics.FullTextLine CurrentLine { get { return _currentLine; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- UnsafeNativeMethods.cs
- UnrecognizedPolicyAssertionElement.cs
- CharUnicodeInfo.cs
- AttributeProviderAttribute.cs
- ListParagraph.cs
- FixedTextView.cs
- DocumentSequence.cs
- RegexFCD.cs
- HttpApplication.cs
- DataControlReference.cs
- ByteStack.cs
- PropertyConverter.cs
- Choices.cs
- DrawingCollection.cs
- TransactionsSectionGroup.cs
- ProjectionCamera.cs
- FilePrompt.cs
- _SslStream.cs
- LinkDescriptor.cs
- ToolStripDropDownClosingEventArgs.cs
- ConnectionManagementElement.cs
- Annotation.cs
- BufferModeSettings.cs
- SqlServices.cs
- ValidationErrorCollection.cs
- CompiledRegexRunnerFactory.cs
- WrappedKeySecurityToken.cs
- BaseCollection.cs
- SqlGenericUtil.cs
- DebugView.cs
- XmlWrappingReader.cs
- DataControlCommands.cs
- PartitionResolver.cs
- PropertyDescriptor.cs
- GetKeyedHashRequest.cs
- ShortcutKeysEditor.cs
- InstanceDataCollection.cs
- EventNotify.cs
- AbandonedMutexException.cs
- ReflectionTypeLoadException.cs
- ConnectionProviderAttribute.cs
- EventMappingSettingsCollection.cs
- SetStoryboardSpeedRatio.cs
- EndpointReference.cs
- Visual.cs
- PersianCalendar.cs
- OverrideMode.cs
- ZipIOEndOfCentralDirectoryBlock.cs
- FixedSOMElement.cs
- DataFormats.cs
- SecureEnvironment.cs
- ColorMatrix.cs
- Menu.cs
- PointAnimationUsingKeyFrames.cs
- GenericEnumConverter.cs
- PropertyGeneratedEventArgs.cs
- OLEDB_Enum.cs
- EncoderNLS.cs
- SystemUnicastIPAddressInformation.cs
- SourceSwitch.cs
- ZipIOLocalFileDataDescriptor.cs
- TableParagraph.cs
- XsdDuration.cs
- StoreAnnotationsMap.cs
- Block.cs
- ClientRuntimeConfig.cs
- CompressionTracing.cs
- TableLayoutSettingsTypeConverter.cs
- ClassHandlersStore.cs
- ISessionStateStore.cs
- TraceHwndHost.cs
- Expr.cs
- NetworkCredential.cs
- Size.cs
- EventsTab.cs
- GregorianCalendarHelper.cs
- DesignerObjectListAdapter.cs
- TraceSource.cs
- COM2PropertyBuilderUITypeEditor.cs
- WindowsPrincipal.cs
- DataColumnMapping.cs
- Accessible.cs
- DesignTimeValidationFeature.cs
- PerfCounters.cs
- OraclePermissionAttribute.cs
- IpcChannelHelper.cs
- WebPartCatalogAddVerb.cs
- Underline.cs
- WebSysDescriptionAttribute.cs
- DataObject.cs
- securitycriticaldataClass.cs
- RoutedCommand.cs
- VersionPair.cs
- WebContext.cs
- PolyLineSegmentFigureLogic.cs
- IItemContainerGenerator.cs
- ToolStripPanelRow.cs
- SiteOfOriginContainer.cs
- InvalidWMPVersionException.cs
- PartialCachingControl.cs